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Title: Dual-mode control of tri-state boost converter for improved performance
Authors: Viswanathan, K. 
Oruganti, R. 
Srinivasan, D. 
Keywords: "Constant-Do" control
Boost converter
Dc-dc converter
Dual-mode control
Right-half-plane zero
Small-signal analysis
Tri-state boost converter
Issue Date: Jul-2005
Citation: Viswanathan, K., Oruganti, R., Srinivasan, D. (2005-07). Dual-mode control of tri-state boost converter for improved performance. IEEE Transactions on Power Electronics 20 (4) : 790-797. ScholarBank@NUS Repository.
Abstract: A tri-state boost converter with an additional boost-inductor free-wheeling interval was proposed earlier to eliminate the right-half-plane (RHP) zero that occurs in the control-to-output transfer function of a classical boost converter under continuous-conduction mode of operation. A "constant-Do" control scheme, in which the "capacitor-charging" interval of the converter was kept constant, was employed. This resulted in a relatively large inductor current, especially under high line and load conditions, thereby causing high circuit losses. This paper proposes two variations of a novel dual-mode control (DMC) scheme that vary both the "boost" and the "capacitor-charging" intervals. Control analysis, design, and limitations of the proposed DMC schemes are presented. Through computer simulations and hardware experiments the performance of the tri-state boost converter with DMC schemes are compared with those of the tri-state boost converter with "constant-Do" control scheme, and the classical PI-controlled boost converter. The DMC schemes achieve a significant (about 10%) improvement in converter's efficiency for a wide load range over the "constant-Do" control scheme. © 2005 IEEE.
Source Title: IEEE Transactions on Power Electronics
ISSN: 08858993
DOI: 10.1109/TPEL.2005.850907
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